Put butter and granulated sugar into the bowl of an electric mixer fitted with the paddle attachment. Mix on high speed until pale and fluffy, about 5 minutes. Mix in oil. Reduce speed to low. Mix in flour mixture. Add cream; mix until well combined, about 2 minutes. Mix in egg, then remaining 1/4 cup flour.

Shape dough into 3/4-inch balls, and space 2 inches apart on baking sheets lined with wax paper. Flatten slightly with fingers, and top each with pine nuts. Sprinkle with sugar.